Suspension scale with cam-type action



Umted States Patent 11113,534,824

72 Inventor Enrique J. Rios 854,609 5/1907 Selley 177/216X 424 -i d g FOREIGN PATENTS [211 App No 53%; 731,545 5/1932 .France 177/221 [22] ile April 1969 437,258 6/1948 Italy 177/221 [45] Patented Oct. 20, 1970 Primary Examiner-Robert S. Ward, Jr.

[54] SUSPENSION SCALE WITH CAM-TYPE ACTION 4 Claims, 5 Drawing [52] US. Cl 177/221, ABSTRACT; A suspension scale comprising two grooved 177/216 transparent discs attached together at their sides so as to form [51] Int. Cl 601g 1/02, a channel between their peripheries for holding a suspension 8 string for the object to be weighed. [50] Field of Search l77/l26, A circular tunnel is also formed between aid discs for hold- 224 ing an indicator ball.

A cam is formed externally axially of each disc and the [56] vmmcned weigher is suspended from ribbons which pass over the cams IT D STATES PATENTS and are attached thereto. The opposite ends of said ribbons 35,155 5/1862 Howlett 177/216 re at he to a pivot-mounted supporting pla f rm- FiG.2

Patented 0a. 20, 1970 Sheet Patented 0a. 20, 1970 Sheet mvsm'on SUSPENSION SCALE WITII CAM-TYPE ACTION This invention related to improvement on the scale described in the Cuban Pat. No. 14177 issued to the petitioner, Enrique J. Rios by the Ministerio de Comercio of the Republica de Cuba on Feb. 15, 195 l.

The primary object of this invention is to improve the performance of the scale described in the Cuban Pat. No. 14177.

Another object of this invention is to improve the method of the scale suspension.

Another object of this invention is to simplify the construction and assembly of this scale improving its appearance and reducing its production cost.

These objects and advantages of this invention will be readily apparent from the following detailed description and accompanying drawings.

In the drawings:

FIG. 1 is front view of the scale.

FIG. 2 is a sectional view though the line A-A.

FIG. 3 is a top view of the platform supporting the suspension strip.

FIG. 4 is a detail of the suspension strip anchorage.

FIG. 5 is across section of FIG. 4 at 8-3 rotated 22.

Referring to the drawings, this scale is formed of two transparent discs 1 and 2 joined together at some contact areas by cement, screws, rivets or other appropriate means.

The edge of the discs 1 and 2 make a V groove 26 in which a string 27 is contained.

The string 27 has one end fastened ,to the groove 26 in the notch 28 and at the other end is hanging the clip 29.

Between the discs 1 and 2 a circular groove or tunnel 3 is formed in which a ball 4 can move freely.

A cavity 38 is formed between the central portion of the discs 1 and 2 in which a liquid 39 is contained. The baffles 40 are internal projections of the discs 1 and 2.

Two cams 5 and 6 are lateral projections of the discs 1 and 2 respectively and have fastened by rivets 7 and 8 the lower end of each of the strips 9, 10, 11 and 12.

The strips 9 and 10, on the front side of the scale, have their upper ends fastened to the supporting platform 13 by the rivet 14.

The strips 11 and 12, on the back side of the scale, have their upper ends fastened to the supporting platform by the rivet I5.

An alternate method for the connection between the discs and the suspension strips is shown in the FIGS. 4 and 5. The pin 16, in the center of the recess 17 at the external flat side of the cam 5 is an anchor or support for the suspension strip 9 and 10. The pin 19, in the center of the recess at the external flat side of the cam 6 is an anchor or support for the strip 11 and I2.

With this arrangement strips 9 and it) become one piece 18 and is wrapped around pin 16 recessed into cam 5. A fastener 20 is secured to pin 16 to prevent lateral displacement of strip. This arrangement is also applied to cam 6.

The supporting platform 13 pivots on the pins 23 and 24 to LII keep the discs and suspension strips in a vertical position independently of any off-vertical inclination of the wall on which the bracket 25 is fastened by the nail 32. The screw or rivet 33 allows this movement of the platform on the pins but prevents separation of the platform and bracket.

This floating arrangement of the platform assures proper tracking of the strips on the cams.

The platform 13 supports the scale by the four strips passing through the four notches 34, 35, 36 and 37. These four suspension points avoid torsional movement of the scale around the vertical axis and also prevent pendulum motion from left to right.

This method of suspension limits the scale movement to a rotation in the same vertical plane of the discs 1 and 2, displacing its center of gravity along a vertical line up or down according to the weight of the body hanging from the clip 29.

When the object to be weighed is fastened to clip 29, the whole suspension scale, discs 1 and 2, rotates until a condition This equilibrium is reached when the product of the objects weight by the horizontal distance between the V grooves bottom and the suspension plane is equal to the product of the scales weight by the horizontal distance between the suspension plane and the discs center of gravity (which is the discs center approximately).

The suspension plane is the vertical one contacting the cams 5 and 6 by the tangent point of the strips 9, 10, l1 and 12.

As the ball 4 is always located in the lowest point of the tunnel 3, any rotation of the discs 1 and 2 changes the relative position of the ball 4 and the scale 30 and 31 printed on the disc I close above and below the tunnel 3.

' At any time the location of the ball 4 between the scales-30 and 31 indicates the correct weight of the body suspended by the clip 29. i

The liquid 39 remains in the lower portion of the cavity 38 and the baffles serve to dampen the rotational movement of the discs 1 and 2.

Iclaim:

1. In a scale of the class described, designed to weigh objects suspended by a string or flexible strip, two discs of transparent material joined partly on one side forming a groove or channel by their periphery in which the said string is rolled up, a circular groove or tunnel between the said discs in which a ball rolls freely, at least one scale printed on at least one of the discs close to the said tunnel, one cam at each external side of the said discs on which a flexible suspending strip or ribbon is secured by its center, these two flexible strips, one secured to each cam, having their four ends fastened to a platform that is supported on a bracket or beam.

2. In a scale of the class described, designed to weigh objects suspended by a string or flexible strip, two discs of transparent material joined partly on one side forming a groove or tunnel by their periphery in which the said string is rolled up, a circular groove or tunnel between the said discs in which a ball rolls freely, at least one scale printed on at least one of the discs close to the said tunnel, one cam at each external side of the said discs on which a flexible suspending strip or ribbon is secured to each cam, having its four ends fastened to a platform that is supported on a bracket or beam, the said platform having four notches or guides to keep the hanger strips at the proper distance from each other, one pin, rivet or screw to secure the two ends of one strip, another pin, rivet or screw to secure the two ends of the other strip, two recesses in which nest pins that support the said platform horizontally by the pull of the hanger strips and a pin, rivet or screw to keep a proper distance between the said platform and the said supporting pins.

3. In a scale of the class described, designed to weigh objects suspended by a string or flexible strip, two discs of transparent material joined partly on one side forming a groove or channel by their periphery in which the said string is rolled up, a circular groove or tunnel between the said discs in which a ball rolls freely, at least one scale printed on at least one of the discs close to the said tunnel, one cam forming part of each disc with a flat edge to accomodate a strip that supports hanging both said discs and cams, each cam having a recess close to its central portion that corresponds to the disc center, through this recess passing the said hanging strip circling around a pin located at the recess center and a nut or retainer washer at the end of each said pins to prevent lateral desplacement of the said hanging strips.

4. In a scale of the class described, designed to weigh objects suspended by a string or flexible strip, two discs of transparent material joined partly on one side, these two discs forming a single unit bonded together, at least three circular cavities concentric with the discs centers located between their contacting faces, one of said cavities open at the discs periphery having the proper shape to accomodate the said string or flexible strip in a manner of a pulley, a second cavity or tunnel confined close to the discs periphery having an approximately round section to accomodate a ball able to run teslxsllstqv qthsssisssv txsrtsnn l nd s. t ns a1s.

printed on at lgast one of the discs adjacent to tho cavity} or tunnel. a third cavity, containing liquid, located at the cen- 

